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1uaq

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{{STRUCTURE_1uaq| PDB=1uaq | SCENE= }}
{{STRUCTURE_1uaq| PDB=1uaq | SCENE= }}
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'''The crystal structure of yeast cytosine deaminase'''
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===The crystal structure of yeast cytosine deaminase===
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==Overview==
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Yeast cytosine deaminase is an attractive candidate for anticancer gene therapy because it catalyzes the deamination of the prodrug 5-fluorocytosine to form 5-fluorouracil. We report here the crystal structure of the enzyme in complex with the inhibitor 2-hydroxypyrimidine at 1.6-A resolution. The protein forms a tightly packed dimer with an extensive interface of 1450 A2 per monomer. The inhibitor was converted into a hydrated adduct as a transition-state analog. The essential zinc ion is ligated by the 4-hydroxyl group of the inhibitor together with His62, Cys91, and Cys94 from the protein. The enzyme shares similar active-site architecture to cytidine deaminases and an unusually high structural homology to 5-aminoimidazole-4-carboxamide-ribonucleotide transformylase and thereby may define a new superfamily. The unique C-terminal tail is involved in substrate specificity and also functions as a gate controlling access to the active site. The complex structure reveals a closed conformation, suggesting that substrate binding seals the active-site entrance so that the catalytic groups are sequestered from solvent. A comparison of the crystal structures of the bacterial and fungal cytosine deaminases provides an elegant example of convergent evolution, where starting from unrelated ancestral proteins, the same metal-assisted deamination is achieved through opposite chiral intermediates within distinctly different active sites.
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(as it appears on PubMed at http://www.pubmed.gov), where 12637534 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12637534}}
==About this Structure==
==About this Structure==
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[[Category: Wang, A H.J.]]
[[Category: Wang, A H.J.]]
[[Category: Alpha-beta-alpha]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:58:30 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:10:12 2008''

Revision as of 16:10, 27 July 2008

Image:1uaq.png

Template:STRUCTURE 1uaq

The crystal structure of yeast cytosine deaminase

Template:ABSTRACT PUBMED 12637534

About this Structure

1UAQ is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Crystal structure of yeast cytosine deaminase. Insights into enzyme mechanism and evolution., Ko TP, Lin JJ, Hu CY, Hsu YH, Wang AH, Liaw SH, J Biol Chem. 2003 May 23;278(21):19111-7. Epub 2003 Mar 13. PMID:12637534

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